Over-the-range microwaves come as small as 1.1 cubic feet, which translates into about 28 inches wide, 15 inches deep and 12.6 inches high. The smallest countertop microwaves are even smaller at 0.7 cubic feet.
Over-the-range microwaves install above the stove and function as range hoods as well as microwaves. Over-the-range microwaves are ideal for small kitchens because they don't take up any counter or storage space. Their range hoods have powerful fans and a ventilation system to pull steam and cooking fumes away from the cook. Most have lights to illuminate the cooking range. They typically require installation by a professional.